US3583961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrated polymers crosslinked with polyisocyanates
Assignee: Raychem Corp
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Filing: 1968-08-30
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Granted: 1971-06-08
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Expires: 1988-08-30
Abstract
Abstract NITRATED POLYMERS, FORMED BY TREATMENT OF THE POLYMERS WITH NITROGEN DIOXIDE, ARE CROSSLINKED EITHER BY REACTION WITH POLYFUNCTIONAL ISOCYANATE COMPOUNDS ALONE OR ALTERNATELY BY THE SEQUENTIAL REACTION OF A POLYISOCYANATE COMPOUND FOLLOWED BY THE EXPOSURE OF THE NITRATED POLYMER-ISOCYANATE SYSTEM TO WATER OF SIMILAR REAGENT WHICH CONTAINS TWO OR MORE REACTIVE HYDROGEN ATOMS. WITH EITHER OF THE ALTERNATE CROSSLINKING SCHEMES, THE REACTIONS CAN BE ACCELERATED BY THE USE OF CATALYST.
Inventors
- 👤 Daniel Magay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:05
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6283; C08F; C08F8/00; C08F8/30; C08L; C08L57/00; C08F210/00; C08F210/02; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |